Study on the Adsorption Properties of Oxalic Acid-Modified Cordierite Honeycomb Ceramics for Neutral Red Dyes

Shuhui Yang; Qingyan Cheng; Liangyan Hu; Yunhan Gu; Yanji Wang; Zhenfa Liu

doi:10.1021/acsomega.3c00305

Study on the Adsorption Properties of Oxalic Acid-Modified Cordierite Honeycomb Ceramics for Neutral Red Dyes

ACS Omega. 2023 Mar 20;8(12):11457-11466. doi: 10.1021/acsomega.3c00305. eCollection 2023 Mar 28.

Authors

Shuhui Yang¹, Qingyan Cheng^{1

2}, Liangyan Hu¹, Yunhan Gu¹, Yanji Wang^{1

2}, Zhenfa Liu³

Affiliations

¹ School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300401, China.
² Tianjin Key Laboratory of Chemical Process Safety, Tianjin 300401, China.
³ Institute of Energy Sources, Hebei Academy of Science, Shijiazhuang, Hebei Province 050081, China.

Abstract

Removal of organic dyes from water by monolithic adsorbents is considered as an efficient and no-secondary pollution method. Herein, for the first time cordierite honeycomb ceramics (COR) treated with oxalic acid (CORA) were synthesized. This CORA exhibits outstanding removal efficiency toward the azo neutral red dyes (NR) from water. After optimizing the reaction conditions, the highest adsorption capacity of 7.35 mg·g^-1 and a removal rate of 98.89% could be achieved within 300 min. Furthermore, investigation of the adsorption kinetics indicated this adsorption process could be described as a pseudo-second-order kinetic model with k ₂ and q _e of 0.0114 g·mg^-1·min^-1 and 6.94 mg·g^-1, respectively. According to the fitting calculation, the adsorption isotherm could also be described as the Freundlich isotherm model. The removal efficiency could be maintained above 50% after 4 cycles, negating the need for toxic organic solvent extraction, offering a method for bringing the technology one step closer to industrial application and giving CORA promising potential in practical water treatment.